By switching to GitHub you will get more visibility and
contributions:
"Moving FlashDevelop from Google code svn to Github did
effectively result in a huge increase in code contributions"
"Symfony [...] the switch to GH brought a lot of new
contributors, tickets & PRs. That was a great move."
"I moved WebPagetest from Google code to Github around a year
ago. On Google code it was pretty much a ghost town [...] On Github
there are 29 contributors and 98 forks"
"I remember Walter Bright saying that D's compiler (dmd) had a
10x increase in contributions after moving to GiHub"
Feedbacks coming from
https://plus.google.com/+SethLadd/posts/d4XAL24Te1L
Cons:
"There's one thing you have to pay attention to though:
switching to GH will probably mean every more tickets created and
more time spend to triage the issues.﻿"
Anyway, thanks for this great tool: I use it everyday with love.